No, I am not talking about the NSA here. I am referencing an emerging class of location-based marketing companies that rely on a cell phone's Wi-Fi signal and a sensor to track customer habits so they can better market and sell to them.
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One area in which Radio Shack is winning big is on Foursquare. It started the summer of 2010 when Radio Shack joined the location-based service.
Internet companies have appropriated the real estate business's mantra -- it's all about location, location, location.
But while a home on the beac...
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